Numerical Simulation Analysis Of Interfacial Shearing Action Of Anchored Bedding Rock Slope With Weak Layer Under Earthquake

China is a country with severe geological disasters such as earthquake landslides and collapses.As a common method for slope support,anchorage technology has been widely used in engineering because of its low cost,easy construction and good performance.However,due to the complexity of the anchorage mechanism of rock and soil under earthquake,there are few related studies,which can not meet the needs of engineering.As the key and weak part of the anchorage system,the anchorage interface is in urgent need of further research.In view of this,this paper takes the anchored bedding rock slope with weak layer as the research object,and a numerical model is constructed by combining solid element and interface element uses FLAC3D software.The distribution of anchor axial force and the shear stresses of two interfaces and their evolution under earthquake are studied.The effects of different influence factors on the interfacial shearing action is explored,and the similarities and differences between the two numerical modeling methods are analyzed.The main research work and conclusions are as follows:(1)The solid element is used for rock,bolt and grout,and the interface element is used for the two anchorage interfaces.It is feasible to establish an anchored rock slope model to study the shearing action of slope anchorage interface by combining the two elements,which can well reflect the shearing action of anchorage interfaces and its stick-slip properties.(2)Under the action of earthquake,the axial force distribution of the anchor is very uneven,showing a convex herringbone distribution and reaching a peak at the weak layer.With the continuous loading of seismic waves,the axial force increases gradually,and develops from adjacent to the weak layer to far away from the weak layer,but the peak position of the axial force remains unchanged.(3)Under the action of earthquake,the shear stress distribution on the two anchorage interfaces is very uneven,showing a "large middle and small head"distribution,and the interfacial shear stress at the neutral point is zero.With the continuous loading of seismic waves,the interfacial shear stress increases until the ultimate bond strength of the two anchorage interfaces is reached,and then the interface is debonded,and the two peak shear stresses gradually transfer to the two ends of the anchor.(4)With the increase of seismic wave amplitude and duration,the debonding length and debonding rate of the two anchorage interfaces increase.As the frequency of the seismic wave increases,they increase first and then decrease.With the increase of the tensile strength,cohesion and internal friction angle of the weak layer,both of them gradually decrease.The ground motion parameters are more sensitive,while the sensitivity of the weak layer parameters is relatively small.(5)There are two modeling methods:the combination of solid element and interface element,and the combination of solid element and cable element.There are differences in the simulation results and so on,but both of them can achieve the debonding of the two anchorage interfaces.In the process of seismic wave loading,the interfacial shear stress has the similar trend.Figure[44]table[8]reference[93]...